There are more of this chests for example at the beginning of 8squared. They were disabled some time ago with the new crafting system/ remove of the costume drops, they dropped costumes and some buff/ boost items if I remember correctly.

Hi The_Traveler, I like your ideas... But dont think Drago is able to create this features, they are already too busy with the other old bugs (or not?). Combo system could be the easiest thing to implement ( in UE4 dont know how in the old unreal engine)